Laser induced periodic surface structuring for surface enhanced raman spectroscopy

Özkarslıgil, Zeynep Tuğçe
In this study, our aim is to fabricate and characterize efficient substrates of surface enhanced Raman spectroscopy (SERS) utilizing the field enhancement due to hot spots made by recently developed method of laser induced periodic surface structuring (LIPSS). LIPSS is a cost-effective technique for rapid processing of almost any materials compared to conventional lithography methods. Coating of a thin silver film on LIPSS applied substrate surface provides to observe the localized surface plasmon effect for SERS measurement with the use of Raman reporter molecules interacting with silver substrate at the plasmon frequency. In order to characterize the optical properties, diffuse and total reflectivity of the substrates will be measured. Among possible expected applications of such prepared substrates are photonic templates for thin film optoelectronic devices with strong field enhancement properties.


Akbıyık, Alp; Bek, Alpan; Department of Physics (2022-6-10)
In this thesis, Surface-Enhanced Raman Spectroscopy (SERS) substrates are fabricated using laser assisted chemical etching of silicon as a surface nanostructuring technique. As a novel method of control over the structuring parameters, the incident laser illumination is spatially modified via a Digital Micromirror Device (DMD) that enable fast and uniform fabrication of complex structures. Onto the photochemically nanostructured silicon surfaces, silver and gold films are deposited by thermal evaporation or...
Parameter estimation for instantaneous spectral imaging
Öktem, Sevinç Figen; Davila, Joseph M (2014-05-04)
Spectral imaging is a fundamental diagnostic technique in physical sciences with widespread application. Conventionally, spectral imaging techniques rely on a scanning process, which renders them unsuitable for dynamic scenes. Here we study the problem of estimating the physical parameters of interest from the measurements of a non-scanning spectral imager based on a parametric model. This inverse problem, which can be viewed as a multi-frame deblurring problem, is formulated as a maximum a posteriori (MAP)...
E-Beam lithography designed substrates for surface enhanced Raman spectroscopy
CİNEL, NEVAL AYŞEGÜL; Cakmakyapan, Semih; Butun, Serkan; Ertaş, Gülay; ÖZBAY, Ekmel (2015-06-01)
Surface Enhanced Raman Spectroscopy (SERS) is a popular method that amplifies weak Raman signals from Raman-active analyte molecules making use of certain specially-prepared metallic surfaces. The main challenge in SERS is to design and fabricate highly repeatable, predictable, and sensitive substrates. There are many fabrication methods that strive to achieve this goal, which are briefly summarized in this paper. The E-beam lithography method is proposed to be superior to the mentioned techniques. In this ...
Application of Surface-Enhanced Raman Scattering (SERS) method for genetic analyses
Karabıçak, Seher; Volkan, Mürvet; Kocabıyık, Semra; Department of Chemistry (2011)
Raman spectroscopy offers much better spectral selectivity but its usage has been limited by its poor sensitivity. The discovery of surface-enhanced Raman scattering (SERS) effect, which results in increased sensitivities of up to 108-fold for some compounds, has eliminated this drawback. A new SERS active substrate was developed in this study. Silver nanoparticle-doped polyvinyl alcohol (PVA) coated SERS substrate prepared through chemical and electrochemical reduction of silver particles dispersed in the ...
Laser Induced Periodic Surface Structured c-Si Solar Cell with more than 16% efficiency
Goodarzi, Arian; Candemir, Ozun; Nasser, Hisham; Borra, Mona Zolfaghari; Genc, Ezgi; Çiftpınar, Emine Hande; Bek, Alpan; Turan, Raşit; Pavlov, Ihor (2021-06-01)
Crystalline-Si (c-Si) based solar cells (SC) efficiency remains one of the most challenging part in photovoltaic industry. Besides of the thermodynamical limits, the optical losses due to indirect band-gap structure of the material require additional treatment which known as a photonic design of the SC surface [1]. Numerous manipulations are performed to increase the efficiency of commercial solar cells. In most of these methods, the main concept is increasing light interaction by the cell through chemical ...
Citation Formats
Z. T. Özkarslıgil, “Laser induced periodic surface structuring for surface enhanced raman spectroscopy,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Physics., Middle East Technical University, 2020.